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Math Question

#5
if both of those are in the same part of the question ie both as a) then I would say that you do it by simultaneous equations

x + y = -8 --> leave
x - 2y = 7 --> multiply by -1

x + y = -8
-x + 2y = -7

add these

3y = -15 --> y = -5

x + -5 = 8 --> x = -3
x - 2(-5) = 7 --> x = -3

x = -3
y = -5

both equations work, so yeah I think this is the right way to do it
 
#11
Originally posted by almostfamous88
to get that answer you use system of equations. which means multiplying by a certain number to get something in common so they cancel out!
look at my post above, thats what I did
 

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